Dr. Nicky Liebermann specialized in Internal Medicine (1982-1988) at Meir Hospital, becoming chief resident after 6 months and Deputy Director of the Hospital until 7/1993. Lieberman served as Medical Director of the Sharon-Shomron District in Clalit Medical Services, the largest HMO in Israel and one of the largest in the world, and Sharon Shomron district being its second largest district. He held this position 1993–1998, and introduced risk management, quality assurance, and disease management in the district. Since 1998 he is head of the Community Medical Division at Clalit.
Being one of the founders of the Israeli chapter of the ISPOR – in 2011 he was ellected as president of the Israeli chapter (Iternational Society for Pharmacoeconomics and outcomes research). In 2014 Liebermann was also elected as Chair-Elect by the Health Service Providers (Clinicians) Committee in the ISPOR- ASIA region, being chair until 2018.